What Our Gearhead® Experts Are Saying:"The Summit Gilltek Jacket is my go-to for stop-and-go adventures. Whether I’m layering for resort laps or tackling a backcountry tour, the Gilltek insulation helps regulate temperature—keeping me warm when I stop and venting excess heat when I move. The packable design is a bonus, easily stashing into its own pocket when I don’t need it. Lightweight, breathable, and versatile, this jacket is a must-have for unpredictable conditions."Designed for high-output adventures, the Summit Gilltek Jacket keeps you comfortable whether you're in motion or at rest. This lightweight insulator features Gilltek™ technology, which adapts to your activity by trapping heat when you're still and venting it when you're on the move. Made with recycled materials and filled with Primaloft® Gold Active insulation, it offers warmth without bulk while maintaining breathability. The articulated elbows provide freedom of movement, and the packable design lets you stash it in its own pocket for easy storage—doubling as a travel pillow when needed. From brisk resort days to backcountry ascents, this jacket is built for those who never slow down.